Iris diaphragm



July 28, 1925. 1,547,658

H. KUNZE -IRIS DIAPHRAGM Filed Aug. 16, 1923 Patented July 28, 1925,

UNITED STATES Larissa PATENT OFFICE.

HUGO KUNZE, OF JENA, GERMANY, ASSIGNOR TO THE FIR-M CARL ZEISS, OF JENA,GERMANY.

IRIS DIAII-IRAGM.

Application filed. August 16, 1923. Serial No. 657,764.

To all whom 2'25 may concern.

Be it known that I, HUGO KUNZE, a citizen of Germany, and residing atJena, Germany, have invented a new and useful Iris Diaphragm (for whichI have filed an application in Germany 011 October 14, 1922), of whichthe following is a specification.

The present invention relates to iris-diaphragms fitted with curvedlamellze which are supported at both ends, viz at the one end rotatablyabout a fixed axis and at the other end displaceably relatively to themount of the iris-diaphragm in their longitudinal direction. Accordingto the invention the single lamellae of these diaphragms are recessed ontheir hollow side from the point, which with the closed diaphragm comesto lie into the centre of the diaphragm to almost the end, rotatableabout a fixed axis, so that this side of each lamella is narrower thanthe remaining part of the same. The invention is based upon theknowledge that, in order to attain the ettect of the diaphragm alreadythose parts of the lamellzc are sutiicient which with the closeddiaphragm lie between the centre of the dia phragm and the ends of thelamellae, displaceable relatively to the diaphragmmount, andthat itsutiices to construct the remaining part-s of the lamellee as carryingarms for the first-named parts which may be narrower than those partsacting as the diaphragm proper. By means of the re cessed parts of thecarrying arms it is possible to avoid, especially with the closeddiaphragm, the accumulation of material in the centre of the diaphragm,whereby a greater mobility of the lamellze in the vicinity of theclosing state of the diaphragm is obtained and besides, even withcomparatively thick lamellas, an almost complete closing of thediaphragm.

The annexed drawing shows in five figures a constructional example of aniris-dia phragm according to the present invention. Figs. 1 and 2represent a trout view each of the diaphragm, viz in Fig. 1 the lamellaeare shown in the position corresponding to the smallest diaphragmaperture and in Fig. 2 in a middle position, Fig. 3 represents a backview of the diaphragm, whereby the lamellze are in the same position asin Fig. 2. Fig. 1 shows only a part of the lainellze for the sake ofdistinctness. Fig. 4 is a section on the line 4% of Fig. 2 and Fig. 5 isa front view of a single lamell a.

In the example shown the lamellic a are supported at their one end in amount Z) rotatably about pivots 0 fixed in the mount Z). At their otherend the lamellaa are supported in a ring 6 rotatable in the mount 7),whereby lamellze are displaceable by pins (Z in corresponding slits c ofthe ring '6 From the points which with the closed diaphragm come to lieinto the centre M 01 the same, the lamellae are recessed, as shown inthe drawing, towards those ends which are rotatable about the fixedpivots c. As may easily be seen from the drawing, this does not impairthe effect of the diaphragm.

I claim:

In an iris-diaphragma mount comprising two parts rotatable relatively toone another about the aXis of the diaphragm, a plurality of curvedlamellze, each of which is supported at one of its ends rotatably abouta. fixed axis at one of the said two parts and at its other enddisplaceably relatively to the other part in its longitudinal direction,the said lamellze being reces ed on their hollow side from the point,wlnch with the closed diapln'agm comes to lie into the centre of thediaphragm, to almost the end, rotatable about a fixed axis, so that thispart of each lamella is narrower than the remaining part of the same.

HUGO KUNZE.

